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a. Outfalls, sediment basins, retention/detention ponds will be inspected at least once every five <br />years. If warranted by required sediment removal or maintenance needs, inspections will be <br />conducted at a greater frequency. <br /> <br />b. Structural stormwater management facilities including, but not limited to, grit chambers, <br />sump catch basins, sump manholes and appurtenant conveyances, as well as infiltration and <br />biofiltration BMPs including, but not limited to, vegetated swales, rain gardens and filtration <br />features, will be inspected annually to ensure structural integrity, proper function and <br />treatment effectiveness. If, after the first two annual inspections, maintenance or sediment <br />removal is not required then the frequency will be reduced to once every two (2) years. Should a <br />subsequent inspection indicate the need for sediment removal or maintenance, the inspection <br />schedule will revert to annual inspections following the completion of the maintenance work. If, <br />after the first two post-maintenance annual inspections, no additional maintenance or sediment <br />removal is required, then the inspection frequency will be reduced to once every two (2) years. <br /> <br />c. Proprietary devices will be inspected per manufacturer/installer recommendations, and at <br />least annually. <br /> <br />d. All inspections will occur at a time that allows CITY to determine if the facility is functioning as <br />designed. <br /> <br />e. In addition, CITY will respond promptly to notice from the RCWD that a facility may require <br />inspection or maintenance. Within one month of notice, CITY will inspect and advise the RCWD <br />on the results of the inspection. <br /> <br />2. CITY will maintain, repair or replace BMPs when inspection indicates this is necessary to restore <br />design performance. Maintenance necessity will be as recommended in Minnesota Stormwater Manual <br />guidance. CITY will complete work within six (6) months of inspection, except that periodic sediment <br />removal from basins will be completed within eighteen (18) months of inspection. Alternatively, an <br />RCWD-approved maintenance schedule may be used as a work timeline. <br /> <br />3. CITY will submit a copy of its MS4 permit annual report to the RCWD at the same time that it is <br />required to be submitted to the MPCA, with any supplement as needed to briefly describe dates, <br />locations and descriptions of inspection and maintenance activities. <br /> <br />4. CITY will inspect and maintain City-owned structures and improvements in and adjacent to regional <br />conveyance systems and public drainage systems as follows: <br /> <br />a. CITY will inspect the structure or improvement as part of the MS4 requirements. <br /> <br />b. CITY, at its cost, will maintain the structure in good repair to preserve hydraulic and <br />navigational capacity in accordance with RCWD-approved plans; provide for no net increase in <br />flood stage beyond that of RCWD-approved plans; avoid increased scour, erosion and <br />sedimentation, water quality impact and change to the existing flowline/gradient; and prevent <br />conditions that promote hydraulic or navigational obstruction. <br /> <br />c. CITY will repair eroded or other unstable conditions resulting from the structure or <br />improvement as promptly as weather and seasonal conditions allow. <br /> <br />2 <br />Qbhf!2:9!pg!335 <br /> <br />